Artan, who was referred to by ISIS as a “soldier of the Islamic State” by the Islamic State’s Amaq News Agency, had posted several messages on Facebook that could have been an indication of what was to come.

NY Daily News reported that in one post, Artan spoke of “sleeper cells” and Muslims who were “waiting for a signal.”

He warned that if America wanted “Muslims to stop carrying lone wolf attacks, then make peace with ‘dawla in al sham,’” a term for ISIS.

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In another post, Artan said the U.S. should stop meddling in the affairs of other countries.

“We are not weak. We are not weak, remember that,” he wrote.

Born in Somalia, Artan came to the U.S. as the child of a refugee and became a legal permanent resident.

Prior to coming to the U.S. Artan lived in Pakistan for seven years, from 2007 to 2014.

In May, he graduated cum laude from Columbus State Community College, subsequently going to OSU.

A YouTube video shows Artan appearing to jump with excitement as he received his degree at the graduation ceremony.

A neighbor of Artan, Seth Harris, a 32-year-old army veteran and prison guard, said that he was “shocked” that the university student who lived just a few doors down committed the attack.

“I’m shocked that this happened,”he said. “I’m shocked that it turned out to be my neighbor … I wouldn’t expect him to do something like this.”

Another student who was at the center of Monday’s attack recalled the intense sequence of events as Artan rammed a car into a group of people and then took a butcher knife stabbing, slashing and chasing people.

“Once he let off the gas pedal and the car came to a stop, I began to take a few steps toward the car to help people who were hit by the vehicle,” Payne told Springfield News-Sun.

“That’s when the individual got out with a knife and he attacked someone to my right. Then he turned to attack me and I grabbed the knife with my left hand, which gave me enough time to get under his arm and away from him.”

Ohio Gov. John Kasich said that Artan’s true motive will likely remain a mystery.